[Intondou (Stealth Moko)] Mahou Shoujo Riena

Magical girl Riena's crusade against evil ends face-down in writhing tentacles when a towering demoness drags her back to her hideout for a very different kind of punishment. Between the crack of the whip and the slow drain of her energy, the once-proud heroine of justice is broken into a teary, begging mess who learns to prefer pleasure over pain. By the final page she kneels collared and adoring in her mistress' service, heart-eyed and eager to spend her days as the demon's devoted energy slave.